Malicious PDF — malware analysis report

Static analysis result for SHA-256 857a148f5e93e1fd…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 20:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e0dac3099e184804bf8118e1f175825d SHA-1: 82c97f0b0a6b79f412529c58e6108cd2c6aa0b60 SHA-256: 857a148f5e93e1fdd6df32befd081350b47e96b25ac66a47100c4def3da25d32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bataretak.com/img/files/file/21212124625.pdf In PDF document text
    • https://ivanda-commerce.hr/userfiles/file/lujijapil.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062407570174.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ihj2ct30mg4ij2bsrl76k8etoj/bamadivutasadeza.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/83407909376.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202107240208378874.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/43235757759.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/051604405151.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/bebe3bc5962349280b4e50c63f45cf37/11373197229.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/91453757192.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/h9h2a07j6ika6hrve7gl5be96n/fonikiditafevoxigoxi.pdfIn PDF document text
    • https://autoskola-scp.com/files/faburakukopabakisi.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a72144bda3d---nikinavivukemaku.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/40580239870.pdfIn PDF document text
    • https://eurocomm-italia.com/file/38495121770.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/takilusufofavixubawaz.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/taravakij.pdfIn PDF document text
    • http://livilgirls.com/files/lebinibunuzuwoko.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021081207533532.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/19sab4sb119feuq27otb5nnt4a/95287773249.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/60671175762.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/15443792729.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/55370291878.pdfIn PDF document text
    • http://patroha.hu/file/kokopukipaxojupona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=death+certificate+application+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A5 10552 bytes
SHA-256: 9a05745b62c2eecb682d5c18c1487169b7875235be9ad87a05ef90b5c3b5df97
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 17604 bytes
SHA-256: 353018d4963afb5e272aa1b22abfe4e9c3204aaefdcb671410b904f65fc710ff
font_02_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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